Furnace displays E05; often associated with flow temperature sensor issues.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Open or shorted flow NTC, Loose sensor connector, Damaged sensor cable, Control board input fault

Safety first: Isolate power and allow pipes to cool.

Locate flow NTC: Find the sensor clipped to the flow pipe leaving the heat exchanger.
Check connection: Ensure the plug is firmly seated and the cable is intact.
Measure resistance: With power off, disconnect and measure the sensor resistance. Compare to Sime specifications. Replace if out of range.
If sensor is good: The control board may be faulty and should be checked by a technician.

Medium 3/5

Flow NTC Temperature Sensor

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